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Finding the Fourth Proportional to 81,374, 122,061.72 and 28,792.40

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Solution

The fourth proportional to 81,374, 122,061.72 and 28,792.40 is: 43,188.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,374 : 122,061.72 = 28,792.40 : x
  2. Step 2: Convert to fraction form
    81,374/122,061.72 = 28,792.40/x
  3. Step 3: Cross multiply
    81,374x = 122,061.72 × 28,792.40
  4. Step 4: Simplify right side
    81,374x = 3,514,449,866.93
  5. Step 5: Solve for x
    x = 3,514,449,866.93/81,374
  6. Step 6: Final answer
    x = 43,188.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.